@incollection{Horacek89,
  author	= {Horacek, Helmut},
  editor	= {Metzing, D.},
  year		= {1989},
  title		= {Towards principles of ontology},
  booktitle	= {Proceedings of the German Workshop on Artificial Intelligence: GWAI89},
  pages		= {323--330},
  publisher	= {Springer},
  address	= {Berlin, Heidelberg, New York}
}